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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac976ffef31512ebf0ee0593039db1d0f28c93650be7cb0c16d00ca1f5b6576' 
  AND token = '8pBAbEJYpoAVtXxtOifDOHXbAzoWoZo/zE8aFcryd9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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