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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1bcb746da28c16fef92532d6ef942cb96e9d16a64a2996a98b6fdc25cc7a4d' 
  AND token = 'ubAMaQSQvLjQ0QIzhLiE1FJf+q8GMMxJP4XOnPzW7ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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