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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ffe00ca3b986f6111918c7bbba1205def156be768431c6fdcd47c549dcbbb6' 
  AND token = 'H4BdV0igjMAIM4mure0GLRv7akMglv8WaJv9C6RK7tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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