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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d698110b4dae8ab460ffe6270626fd408b4341c83444a93a0b031b9f3e0700' 
  AND token = 'EqE0Z7JCxJmZoXpm7g1KxK4hhVtX9wqWIW2atrXeqCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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