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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ee44d889465a1fd702e9f92c270e2bcfb239dcdf542fa67cab98a117b6064d' 
  AND token = 'zF3CwRWltFtFlLwgJ6ExSpIx1EOUtVdljw0wBdK+34k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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