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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ed336ac260444e2ce9e5b5d36b89b980f63b76b01fb3e388c38a88a1f315d8' 
  AND token = 'OlZWzhG+h/SB4UUTogAYfhE35u7gUMEWMIU0zQ4M6eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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