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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031dd23d50fdf3d63d88ee247942183522d4d4f9aa73c410f3b1c6df13e16543' 
  AND token = 'NblIEGSMPC26hf4sgO65E4ATkf0dg7tQfm9h+ot16ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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