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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f280bd460f93032d8fa57d38957d4fce7dbacea76916ccb300b80dc82ff81867' 
  AND token = 'GgsdpUk/lMP0cWRbAPYTyMNVadsy5L4xqLAlFFKiq5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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