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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ce77c46fd049d5414cf23eaffd07e492e617a9b19e3483dff0e493ce2ddd05' 
  AND token = 'awsB65QLQR4aA78RXb3FV+ZTb+H079hQZOGIPIG7Opo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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