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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7d7a857a8d169b5b80a9a94a04b1d72e90c38671d80f810d552faa5f86fc66' 
  AND token = 'OZTeN16MnIqLBXkaE6o/A2Iw7CZF83OtFhpO+abMb2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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