SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '162d7d33793d00b62b94ed8119217b107c07e94d85054965e603dad864536acf' 
  AND token = 'ZGtvpqW9MVeCoBndmfSIqs2XHm/U2pZ3rgnA4KD/Bkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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