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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e337175a181cd4d4084bcb17896af356a6c49d0b5f894ffb4d9ffdc26110a89f' 
  AND token = 'Qb+eJU514eJSCVPrAbZaXCU+E4uM8wpH85zzILLbO2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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