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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e7e28ef1c78b31406c1f471e17baf9c9f5a3ac2d71ce8c1afa21aad3b70949' 
  AND token = 'pTWKbt4sfSdRTnpzrmD1IyDdnXqenUuw0edGvPoeJ4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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