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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58dae8e174a2724691ec611621fbcb9492c1217aefdb2498eb1629efdadf5ec6' 
  AND token = '7B1ElsqehCVpZD4Gk4hjfTZK7Az1L04v+IkhiwgNX+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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