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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3636fa570ee2891b0cde78e1a70fe3b2775dc7efc0eea01f45ab35b4350566ea' 
  AND token = '59w9AwtAhbvTMu/UqS4ci6BFtGfQUaYzo4zqJCb9DJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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