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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98169b610a370104ed83385af3a8a98fe6a897deb7bf36fe288e0a11650ca3aa' 
  AND token = '9U45ZAQ6Sv+xKcgNVlnP5J1G5pADHXjllSPYKx9ges4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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