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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ed98eac68dc7fe21e84670d5602ffc6a07d0a46c6c62bbe5dbed4c90efaa1d' 
  AND token = 'G8vdnjMwE7pXu5dfA1DlOHSYGSXJxq/eIuqAG93DdoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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