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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174b57ceb6857ad6d73a045a8f2422152ba3cbf7756f5ddb612c331408ed0e41' 
  AND token = 'FOtMkqPndHFpT85rC/gagfS3OV1+lS2TxuZm9h6Dd9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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