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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2514044692f5f5d4665891e424c72544c20364e01d69d4b25fba92e38462d7c4' 
  AND token = 'MbWjw9dXTuoV9gjyVRCZTdUbAUrLVsUehGjI19WDYLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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