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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9be0d2d0be578406b7a3b4d50d2e3f5b4ee02e8e6d91198d99c4c241087eebbe' 
  AND token = 'NWgHAk/P9i2MHOGANAHUWwLI8fltKTrXlgPvPo3NRXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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