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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5acf0fc745db997bae073df01636c8ae796364df42afc5c9a5633c9d536ef35d' 
  AND token = 'LHeUZDMuhCYI+yyDWULfIq+RHr6HJT03JDmi/KoWvrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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