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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec5e9093f70704bc6ee74de5de12d2917b3195ee8f70fb71ced8bfa4600bcbd' 
  AND token = 'w+TYCKki6nxgDKlwm73Ikb7dQGlxE7F71h4RsqWXqTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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