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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34342e7eff5e075dc395a8b58763af8138d2a5f6228cd40664d0c8da61dd27d7' 
  AND token = '0QPF3H49JYY3ZYWlfwDOecfG891ZQOjpWWsagw4h+1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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