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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac472116495d276622f4cfd374547737bc4cd3cb5a132e4311a9da81aa3cca4' 
  AND token = 'AizqDFn6P8hf69knjFpYsJ746Uh+TjOXT1EQrTb4lLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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