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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd9f4ec2df7e1d4f05f937068ae6fd86c17ef1bbb13015bbd7c867d16ef957fe' 
  AND token = 'FFMxh7UzkTZD0wV7eQ2E55B6GccL6F8xsFNBje6B8pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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