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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c08fdeca8c4abaff4fd7bf4ce18ea5bb3d6aaa2af9175ba1ee02ecfd37f3e7' 
  AND token = 'VofG0WPuWSErN7A7vYzp1+EgIIsV11MGeH9pgEzdwps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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