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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a085d1161c82e8a9a24579bd99a72931e5afeb56a6286a61c38a85cb3015e2' 
  AND token = 'j6TB8sCikLbHPWJCCfWd9d5CGeodUFlhj/DfI9+Pyx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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