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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4acc41478a5df76e606463cb1a9a770c7398630acad96c14303944618817fe90' 
  AND token = 'x9bJnz5QVkF/wufLg3Tyngbz80i9AR9I8tuRSuMCtSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00315

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}