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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0cc592a897fd9e071e7a49903ae445f150425d651dd1fa2598e4848ed733dc8' 
  AND token = 'ScdcV+dI37sFhmws4XZnx9ucwm/5Y3FL/bWX4GcemMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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