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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda0ef09f404bfeb28e5ce02e006c46f5e2ee0994d16613e4778417db39239e2' 
  AND token = 'lN4tXe4KRFoOiKNZf2Kk+iKCsCHtwbIVzmEC4hbHK7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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