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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33a7953b167d226a7b2b9d1597c0eac585205edd7a2f63513a3b017d7d6fe7f' 
  AND token = 'IzFcYyeNsqqu6KtIVcCc0Yfwc8QV7FyRBAEVssdwahU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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