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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b80256964a1ae3044de69ef507a72b86f0385541bed164201a9cdb62219d0bea' 
  AND token = 'YOXFwi5ERNGDKRV17mKh+jtZU46fN0+sSbj04HOqtpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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