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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca885e8ce30656c428b5c4e94cb52dcec8c7b3ea66140cc35aafaebc43d89e9' 
  AND token = 'FgILCZzSHLmSwbeVc3KdxpCre8iFcWGLjfVHqbQw7FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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