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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b2b9cf84a940dbf93f012471d8a3a4abce35299d6c6133cd25ac0cb7e1402a' 
  AND token = '/y66qRpi1k3O+vljFv7gBbb7U4C8Bru2C6nX76+cqXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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