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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05e9b39df88735089a81dd3af73d3c19232c707f67d04c4cbf9c5fb7ea9dccb' 
  AND token = 'gPvdvNsYckN2ZU44MXS1o0vTGQrvF7JDuJ0Oi/x3HR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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