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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bec420fb71a01c164ce9c8ed1b7e1795731c1ba8e42ee57e5e009d46539650' 
  AND token = 'MCKOn3QNntR60sVWrpLFa1uy+zUmDrEV+AQn2d+8T/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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