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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '404761b74014b150ab8793bb7c711ba16d252e96e97cf7e82a6a58787ef26660' 
  AND token = 'nu1t1IXt2F/qi5eswAzBDP6BNvh+ST6sLUDPKxW+yLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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