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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da9866c25ca611ba70e630ba1a4cf167453c658be3a44634e3387e574efd573' 
  AND token = '8YU9+N/YNgVwS9r7iSdbnHbu85QdjgJ1hT4gJ91m3Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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