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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb24f4f7efd313b49f1ebd31cffa11904b11a1e6bf03a4e35ee2b26628b5f2ed' 
  AND token = '3Pnd9rhdAW1Mv0U76jLWeBzqVUCv9Wolij3qctHH9NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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