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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd0d05a0c448c87b807566d217724eae14a0d354462aee4694d30b5df2d54c9' 
  AND token = '3HrPQQe7g0IuWmq1OZK36XAkXQ+JQnVFX36PGFmimDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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