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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '498b0173d419094e869b23fe6414e199b8cda2c4f39ea2d893c7b949075c991a' 
  AND token = 'FYd+DycmIY2zUjNA3SY7DIOomSifkgaqK8u0UWyCYJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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