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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63af46d33e4f7d941e0d89acb9719fda5c51c7a0e181f13fe5fc0a9ff8b10833' 
  AND token = 'bqAVOvJr+j8u88NUXhxlCLlE6OAl5/fokJnX2MeAJC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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