SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4955feedd66b78e20c808ec408b5124ca3ca873104b6664f1ce564f5b6834fe2' 
  AND token = 'GyZhKOMNhKw6zRmDYCNpBX9D5jxPxqCrfSa7evPsXdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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