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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3487e69f7806e8810f329e6624d1599476d4be9ff70dce04479b1cf186387333' 
  AND token = 'aw7+zFqakfh8fCM9h/E8DDCB9a4GtNf0IYjqY6S7vLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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