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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d76f038cdb06a35f86a0cca7a2f67c0a0f8c704a77513636c42c5246e472ddf' 
  AND token = 'lENBnAdN7bxJtir9OkdCKHxWHdTmPS7wtmFt6xKzGjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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