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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d42770606cc38ba72d99f8f2be2d242756452e88c4f51d9ce50cc0990ccf3f' 
  AND token = 'r8Drv8sS5KGPwjOrirv8a+ylMuCFVCwzljw0QBQsDWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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