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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68647fd32d3a25d4f6b8c7093ad2ae729044ba76d99f6c91501c6e592b9869e1' 
  AND token = 'd46UxjEf3APcegLQQuudbBNswP+EUcN/JA/ckq4OOuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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