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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917488f2c4fd971a3ca06a6af1605af475e51a2f6fcfab5cf11b34cd8392cbc9' 
  AND token = 'A6RaLNOIzBBzz6Qu5+hi3hZRmpp67DmeHzw3uZQaEQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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