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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dffa5d5d66f80ec6e5b643f45b2cad295c82815cf51e5fc31345f6cfe66dafcc' 
  AND token = '8bwubUskEWqAwyEv9nIAjoLQIq0+htseJbP1/xvMl9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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