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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d73e3d150fb1101be006e66062843a627e0ff15edf6227ffad3c20b3ed8d41' 
  AND token = 'XJTDT1PQt+yjIlirbRGquTQZACKNdI0QwsOgUzZiEAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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