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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156d69636abac168e81413ffb88d1e5541ceb78a5cbb38986c6f3441007c9e71' 
  AND token = 'A2dr8Pibp7cVfnGHVhpaWfYwn29P1u6kjmH/873Ym14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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