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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '678f9fb15fe71640eb9b04e3a3c5a40c29687a799965908f4c1435bd39517cd3' 
  AND token = 'vpkgYD8l+/CxoTmdXdNbvxMs7eH5awz9BPI0uEHgggo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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