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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887e47e238335a27c44a613b602dc3f5406655bff01f13f99588a754eb6946e6' 
  AND token = 'u5lbcAyd4UEmOAs6NdziZXCfqDwuy4E+BC0nRGh97bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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