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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dbc99161b7b60c907f995911c62ef3c848acb621fce16e15df06b2e46f9932e' 
  AND token = '9zwcWZvLFLf0rQ09Q+lLR9RIxycur/35dCaPNz0cdLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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