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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa19b215f55b33354e6d8f334333f145616109510fa0743e6ab053c97019dae' 
  AND token = 'LvREHd01Mf3g2Atm1PTTtccP8sQ3+fuiB3LJSKb6J0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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