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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17420d86c8c66e6efd63b8518ec1cfab712f027b8c8f747dfbadf132eb6c000' 
  AND token = 'nGq6TPk2lNKGqPPTNIV4cjviiuJy1QrDx4SnztnXaoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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