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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced2a344febe684a447d69e18c47106c5256a3787585acd0687216c958a99e97' 
  AND token = 'xuQqnecRvih3fK0DMr3qRAIRes5SJ+Lb/Z5vFwkAOlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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