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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0d23b6d2498d1c26b297e474584d127e91b0fb08d4b85f5b562cc64b13b96d' 
  AND token = 'pR5zijz3pkB2+JwnShHS4BXmKeiSCPwrBMcCA5WWScA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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