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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f7094fe5333d09375ac998fcf40737b9882dc0d6e65b4c00c9729e7f6b7edf' 
  AND token = 'ldg0d7ycL03oampGg7CIFKk2LmR5P6+aY2Ce4FQn/kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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