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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6de74b15bf1ae24e14d98ed75120f8ee2c54e1a4791719372a1cfbdf4eb8556' 
  AND token = 'wUDQXsEkNZqWK/uE04rwKS8UghhSuIlD1kTL/3o5htU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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